Whilst surfing around last night I found this website:
http://www.hoeckmann.de/index.html
There are two items of interest here. Firstly there are historical
maps of Germany at the end of the 18th century and secondly there's
an interactive map of Nordrhein-Westfalen from 1789.
All maps are very clear, very detailed and show many exclaves. I'll
leave it to the experts to spot exclaves of exclaves!
David